Table 1

Patients excluded from the study (n = 921)

IEL, intraepithelial lymphocytes.
  • Histopathological normal colonic mucosa (n = 846)

  • Histopathological features of ulcerative colitis or Crohn’s disease (n = 30)

  • Lymphocytic colitis-like but IEL <20 per 100 surface epithelial cells (n = 34)

  • Miscellaneous conditions (infectious colitis, carcinoid syndrome, ischaemic colitis) (n = 7)

  • Diarrhoea of less than three weeks’ duration (n = 4)